/* Variables globales */
:root {
    --color-primary: #3498db;
    --color-secondary: #2c3e50;
    --color-accent: #e74c3c;
    --color-background: #f9f9f9;
    --color-text: #333;
    --color-text-light: #666;
    --color-border: #ddd;
    --font-primary: 'Poppins', sans-serif;
    --font-secondary: 'Roboto', sans-serif;
    --max-width: 1200px;
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 3rem;
    --spacing-xl: 5rem;
    --border-radius: 5px;
    --box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

/* Reset y estilos base */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-secondary);
    line-height: 1.6;
    color: var(--color-text);
    background-color: var(--color-background);
}

.container {
    width: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* Tipografía */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-primary);
    margin-bottom: var(--spacing-sm);
    color: var(--color-secondary);
    line-height: 1.3;
}

h1 {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-xs);
}

h2 {
    font-size: 2rem;
    margin-top: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
    position: relative;
}

h2::after {
    content: '';
    display: block;
    width: 50px;
    height: 3px;
    background-color: var(--color-primary);
    margin-top: var(--spacing-xs);
}

h3 {
    font-size: 1.5rem;
    margin-top: var(--spacing-md);
    color: var(--color-primary);
}

p {
    margin-bottom: var(--spacing-md);
}

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color 0.3s ease;
}

a:hover {
    color: var(--color-accent);
}

ul, ol {
    margin-bottom: var(--spacing-md);
    padding-left: var(--spacing-md);
}

li {
    margin-bottom: var(--spacing-xs);
}

blockquote {
    border-left: 4px solid var(--color-primary);
    padding: var(--spacing-sm) var(--spacing-md);
    margin: var(--spacing-md) 0;
    background-color: rgba(52, 152, 219, 0.05);
    border-radius: 0 var(--border-radius) var(--border-radius) 0;
}

blockquote p {
    font-style: italic;
    margin-bottom: var(--spacing-xs);
}

blockquote cite {
    font-size: 0.9rem;
    color: var(--color-text-light);
    display: block;
    text-align: right;
}

/* Header */
header {
    background-color: var(--color-secondary);
    color: white;
    padding: var(--spacing-xl) 0;
    text-align: center;
    position: relative;
    overflow: hidden;
}

header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(52, 152, 219, 0.8), rgba(44, 62, 80, 0.9));
    z-index: 1;
}

header .container {
    position: relative;
    z-index: 2;
}

header h1 {
    color: white;
    font-size: 3rem;
    margin-bottom: var(--spacing-xs);
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
}

header h2 {
    color: rgba(255, 255, 255, 0.9);
    font-weight: 400;
    font-size: 1.5rem;
    margin-top: 0;
    text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.3);
}

header h2::after {
    display: none;
}

/* Navegación */
nav {
    background-color: white;
    box-shadow: var(--box-shadow);
    position: sticky;
    top: 0;
    z-index: 100;
}

nav ul {
    display: flex;
    list-style: none;
    padding: 0;
    margin: 0;
    overflow-x: auto;
}

nav li {
    margin: 0;
}

nav a {
    display: block;
    padding: var(--spacing-sm) var(--spacing-md);
    color: var(--color-text);
    font-weight: 500;
    text-decoration: none;
    transition: all 0.3s ease;
    white-space: nowrap;
}

nav a:hover {
    color: var(--color-primary);
}

/* Contenido principal */
main {
    padding: var(--spacing-lg) 0 var(--spacing-xl);
}

section {
    margin-bottom: var(--spacing-xl);
    scroll-margin-top: 80px;
}

.subsection {
    margin-bottom: var(--spacing-lg);
    padding-left: var(--spacing-sm);
    border-left: 2px solid var(--color-border);
}

/* Referencias */
.references {
    font-size: 0.9rem;
    color: var(--color-text-light);
}

.references li {
    margin-bottom: var(--spacing-sm);
}

/* Footer */
footer {
    background-color: var(--color-secondary);
    color: white;
    padding: var(--spacing-md) 0;
    text-align: center;
}

footer p {
    margin: 0;
    font-size: 0.9rem;
}

/* Responsive */
@media (max-width: 768px) {
    html {
        font-size: 14px;
    }
    
    header {
        padding: var(--spacing-lg) 0;
    }
    
    header h1 {
        font-size: 2.2rem;
    }
    
    header h2 {
        font-size: 1.2rem;
    }
    
    nav ul {
        justify-content: flex-start;
    }
    
    nav a {
        padding: var(--spacing-sm) var(--spacing-sm);
    }
    
    .subsection {
        padding-left: var(--spacing-xs);
    }
}

@media (max-width: 480px) {
    html {
        font-size: 13px;
    }
    
    header h1 {
        font-size: 1.8rem;
    }
    
    header h2 {
        font-size: 1rem;
    }
    
    h2 {
        font-size: 1.6rem;
    }
    
    h3 {
        font-size: 1.3rem;
    }
    
    .container {
        padding: 0 var(--spacing-sm);
    }
}